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Investments and Restricted Cash and Investments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investments [Abstract]    
Investments $ 805 $ 877
Equity Method Investments [Abstract]    
Equity Method Investments 887 732
Restricted Cash and Investments [Abstract]    
Restricted cash and investments 465 390
Investments and restricted cash and investments 2,157 1,999
Investments and restricted cash and investments, current (81) (51)
Investments and restricted cash and investments, noncurrent 2,076 1,948
Nuclear decommissioning trust funds [Member]
   
Restricted Cash and Investments [Abstract]    
Decommissioning Fund Investments, Fair Value 338 308
Other restricted cash and investments [Member]
   
Restricted Cash and Investments [Abstract]    
Restricted cash and investments 127 82
Electric Transmission Texas, LLC [Member]
   
Equity Method Investments [Abstract]    
Equity Method Investments 317 221
CE Generation, LLC [Member]
   
Equity Method Investments [Abstract]    
Equity Method Investments 248 255
Bridger Coal Company [Member]
   
Equity Method Investments [Abstract]    
Equity Method Investments 195 204
Agua Caliente Solar, LLC [Member]
   
Equity Method Investments [Abstract]    
Equity Method Investments 62 0
Equity Method Investment, Ownership Percentage 49.00%  
Equity Method Investments, Investment Tax Credit 164  
Other equity method investments [Member]
   
Equity Method Investments [Abstract]    
Equity Method Investments 65 52
BYD Company Limited common stock [Member]
   
Investments [Abstract]    
Available-for-sale Securities, Equity Securities 392 488
Available-for-sale securities, gross unrealized gain (loss) 160 256
Rabbi trusts [Member]
   
Investments [Abstract]    
Life Insurance, Corporate or Bank Owned, Amount 308 290
Other investments [Member]
   
Investments [Abstract]    
Other Investments $ 105 $ 99